保山气田新近系羊邑组二—三段沉积微相
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摘要
保山盆地为滇西的一个具西断东超箕状断陷结构的新近系小型盆地。为搞清区内保山气田的沉积特征,指导该区油气勘探工作,结合沉积岩(物)与沉积环境之间的辩证关系,通过对沉积岩的岩性特征(颜色、岩石类型、岩石结构、黏土矿物、岩相组合)的分析研究,借助于沉积相在测井和地震剖面上的显著特征,研究并划分了保山气田新近系上新统羊邑组二—三段的沉积微相类型。结果表明,在该研究区主要发育了扇三角洲前缘亚相中的水下分流河道、分流河道间、前缘席状砂、河口坝等沉积微相类型,以及浅湖亚相中的浅湖泥和浅湖漫流席状砂沉积微相。剖析各类骨架微相的沉积特征后指出:水下分流河道、河口坝和前缘席状砂为该区最有利的储集砂体。
The Baoshan basin,located in the western Yunnan province,is a small Neogene basin of half fault depression type that is faulted in the west and onlaps in the east.In order to understand the sedimentary features of the Baoshan gas field and guide exploration in the study area,sedimentary microfacies of the 2nd-3rd members of Pliocene Yangyi Fm in the Baoshan gas field are identified based on analyses of petrographic characteristics of sedimentary rocks(such as color,rock type,rock texture,clay minerals and petrographic assemblages)and responses of sedimentary facies on log and seismic section,as well as the relationship between sedimentary rocks(deposits)and depositional environment.The sedimentary microfacies that are recognized in the study area mainly include underwater distributary channel,interdistributary,frontal sand sheet and mouth bar of fan-delta front subfacies,as well as shallow lacustrine mud and cross flow sheet sand of shallow lacustrine subfacies.Analyses of the sedimentary characteristics of each framework microfacies reveal that underwater distributary channel,mouth bar and frontal sheet sand are the most favorable reservoir sandbodies in the study area.
The Baoshan basin,located in the western Yunnan province,is a small Neogene basin of half fault depression type that is faulted in the west and onlaps in the east.In order to understand the sedimentary features of the Baoshan gas field and guide exploration in the study area,sedimentary microfacies of the 2nd-3rd members of Pliocene Yangyi Fm in the Baoshan gas field are identified based on analyses of petrographic characteristics of sedimentary rocks(such as color,rock type,rock texture,clay minerals and petrographic assemblages)and responses of sedimentary facies on log and seismic section,as well as the relationship between sedimentary rocks(deposits)and depositional environment.The sedimentary microfacies that are recognized in the study area mainly include underwater distributary channel,interdistributary,frontal sand sheet and mouth bar of fan-delta front subfacies,as well as shallow lacustrine mud and cross flow sheet sand of shallow lacustrine subfacies.Analyses of the sedimentary characteristics of each framework microfacies reveal that underwater distributary channel,mouth bar and frontal sheet sand are the most favorable reservoir sandbodies in the study area.
引文
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[2]汪彦,彭军,李凯军,等.高分辨率层序地层学在保山盆地永铸街凸起构造—沉积演化中的应用[J].天然气地球科学,2005,16(6):741-746.
[3]吕儒明,陈宗太,汪彦,等.保山盆地永铸街气田沉积物源分析[J].西南石油学院学报,2006,28(3):48-52.
[4]程立华,陈世悦,吴胜和,等.云南大理盆地隐仙溪冲积扇沉积结构特征[J].西南石油学院学报,2006,28(5):1-5.
[5]陈景山,彭军,周彦,等.基准面旋回层序与油层单元划分关系[J].西南石油大学学报,2007,29(2):162-164.
[6]陈景山,唐青松,代宗仰,等.特征不同的两种扇三角洲相识别与对比[J].西南石油大学学报,2007,29(4):1-6.
[7]赵永胜,宋振亚,戴苏兰,等.保山断陷盆地第三系沉积体系及含气远景[J].成都理工学院学报,1998,25(1):94-104.
[8]王益友.几种地化标志在金湖凹陷阜宁群沉积环境中的应用[J].同济大学学报,1979,18(2):51-60.
[9]赵永胜,宋振亚,温景萍,等.保山盆地湖相泥岩微量元素分布与古盐度定量评价[J].海洋与湖泊,1998,29(4):409-415.(修改回稿日期2008-02-19编辑居维清)
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